The Holy Spirit (prior English language usage: the Holy Ghost (from Old English gast, “spirit”) is mentioned in Aramaic Matthew and the Canonical gospels and is the third person of the Holy Trinity—Father, Son, and Holy Spirit, and is Almighty God.[1][2][3] The Holy Spirit is seen by Christians as one Person of the Triune God who manifests as three persons, or in the Greekhypostases,[4] one being.[5] (Personhood in the Trinity does not match the common Western understanding of "person" as used in the English language—it does not imply an "individual, self-actualized center of free will and conscious activity.")[6]

The theology of the Holy Spirit is called pneumatology. The Holy Spirit is referred to as the Lord and Giver of Life in the Nicene creed. He is The Creator Spirit, present before the creation of the universe and through his power everything was made in Jesus Christ, by the Father, Yahweh. He is credited as He Who inspires and allows to interpret all the sacred scripture and leads prophets, both in Old Testament and New Testament. By His Power, Jesus Christ was conceived virginally in the womb of the virgin Mary.[Lk 1:35] He descended over Jesus in a corporal way, as a dove, at the time of his baptism,[Mt 3:16] and a voice from Heaven was heard: "You are my Beloved Son".[Lk 3:22] He is the Sanctifier of souls, the Helper,[Jn 15:26] The Comforter,[Jn 14:16] The Giver of graces, He Who leads souls to the Father and the Son from Whom He proceeds. Christians receive the Fruits of the Holy Spirit by means of his Mercy and Grace.